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In this work we present numerical and experimental results of negative refraction through a negative index
metamaterial based on miniaturized extraordinary transmission stacked subwavelength hole arrays, also known
as stacked fishnet structures, working in the millimeter wave range. Analytical transmittance as a function of
frequency and tangential momentum shows the conditions under which neg ...
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In this work we present numerical and experimental results of negative refraction through a negative index
metamaterial based on miniaturized extraordinary transmission stacked subwavelength hole arrays, also known
as stacked fishnet structures, working in the millimeter wave range. Analytical transmittance as a function of
frequency and tangential momentum shows the conditions under which negative refraction is expected. Due to
the role of the gap-surface-plasmon-polariton-like mode that gives rise to the resonant magnetic response of
this structure, strong dispersion with the angle of incidence is expected. Experimental results using a quasioptical
bench in the millimeter wave band demonstrate negative refraction and, besides, reasonable agreement
with the simulation results is obtained. A discussion based on leaky waves serves to qualitatively explain the
main features. The presented results may find application in the design of new lenses and devices both in the
microwave, terahertz, and optical ranges. [--]